Peter Turchin argues that societies collapse when there isn't enough room at the top. "There is a limited amount of space, but many more elites now ... low-rank elites.

This codeshare deal would give American Airlines a strong Canadian ally to more effectively compete with other transborder codeshare alliances.

The flight, bound for Las Vegas, plunged 475 feet from an altitude of 14,100 feet, according to flight tracking data ...

The passenger jet was responding to an alert of another aircraft in the vicinity, federal authorities said. A Cold War-era ...